通过对18根焊接不锈钢方管混凝土短柱模型试件的轴压试验,观察了各试件的破坏现象,分析了混凝土强度、试件高宽比和钢管板件宽厚比试件轴压承载力的影响,得到了荷载-位移曲线,荷载-应变曲线及柱截面应变强度分布曲线。根据试验现象,试件的破坏模式可以归为两类:一类为钢管在整个柱表面范围内发生局部凸曲,靠柱中焊缝破坏;另一类为局部凸曲未能发展到整个柱表面,在端部或者端部附近焊缝破坏。试验结果表明:混凝土强度越高,试件的轴压承载力越大,但钢管对核心混凝土的约束作用相对减小;焊接不锈钢方管混凝土短柱轴压承载力随试件高宽比的增大而增大,随钢管板件宽厚比的减小而减小;试件截面的角部存在应力集中现象,即截面角部的应力大于截面其余部位的应力;焊接不锈钢方管混凝土短柱具有很好的变形能力,其破坏属于延性破坏,具有良好的安全储备;焊缝强度是影响焊接不锈钢方管混凝土短柱承载力的一个主要因素。 Through the axial compression test of 18 specimens of welded stainless steel square concrete short columns, the failure phenomenon of each specimen was observed. The axial compressive bearing capacity of concrete specimens, the aspect ratio and the aspect ratio of steel plate were analyzed The load-displacement curve, load-strain curve and column strain distribution curve are obtained. According to the test phenomenon, the failure modes of the specimens can be classified into two types: one is that the local buckling of the steel pipe occurs in the whole surface of the column, the failure of the weld in the column; the other is that the local buckling fails to develop to the whole column Surface, near the end or near the weld damage. The test results show that the higher the concrete strength is, the larger the axial compressive load capacity of the specimen is, but the restraining effect of the steel tube to the core concrete is relatively reduced. The axial compressive bearing capacity of the welded short- Which increases with the decrease of the aspect ratio of the steel plate. The stress concentration exists in the corner of the cross section of the specimen, that is, the stress in the corner of the section is larger than the stress in the rest of the section. The welded stainless steel square concrete short column has Good deformation capacity, the damage belongs to ductile damage, with good safety reserves; weld strength is a major factor affecting the bearing capacity of welded stainless steel square concrete short columns.